Some months ago, I mistakenly thought that Steam was already open beta and downloaded the closed beta version of the software. Today I tried to uninstall the old version using sudo apt-get remove steam, and it seemed to work. But after I installed the latest steam package, I still get the message that steam is closed beta only. Something of the old version must have been left behind; I do not have this problem on my other computer, which never had Steam until today.